Experiment of using thermal insulating materials for accumulation of heat in the transmission

Abstract

Operation of production vehicles in conditions of negative temperatures is related to certain difficulties. One of the main problems is the intensive heat extraction from the unit surface in the environment. As a result of heat exchange, the thermal mode of the unit work is broken. It leads to the change of viscosity-temperature characteristics of lubricating oil. Operation of transmission units in such conditions results in the decrease of vehicle fuel efficiency, diminution of service life of the main units and parts and deterioration of ecological efficiency of their work. This article is devoted to the experiment of using thermal insulating materials aimed at reducing heat loss in the transmission. The method of calculation of thickness of a thermal insulation layer is proposed. The necessity of the employment of infrared thermal imaging to detect areas subject to insulation is substantiated. It is revealed that the area of insulation on the unit under study makes up 1.45 m2. The intensity of transmission cooling with the use of liquid insulation is studied. It is established that the insulation of the unit casing allows reducing heat removal rate and increasing cooling-off time from 360 to 540 minutes. The process of heating of the thermally insulated unit is studied. It is determined that the use of liquid insulation allows intensifying the unit heating. The time to stabilization mode decreases by 35% to 45 minutes, and the stabilized temperature increases by 8 K.

Modeling of Thermal Preparation of Shock Absorbers of Trucks

“…A large number of works related to the research of shock absorbers are devoted to the development of mathematical models (Domnyshev et al, 2019;Hou et al, 2011;Mollica and Youcef-Toumi, 1997;Ramos et al, 2005), parameter optimization and structural modernization (Ankitha and Rupa Sri, 2021;Czop et al, 2012;Duym, 2000;Więckowski et al, 2018;Wszołek, 2016), as well as research using CFD and FEM analysis (Chen et al, 2013;Duym, 2000;Herr et al, 1999;Lee, 1997;Shams et al, 2007). It should be noted that a significantly smaller number of works are devoted to the study of the operation of components and assemblies of cars (including shock absorbers) during operation in cold climates (Chernukhin, 2013;Chernukhin et al, 2020;Dolgushin et al, 2019), although this is an actual scientific direction for many regions of the world.…”